Death ray and full health:
Press [Backspace] during a mission. Note: Enabling this code will bring your total money to zero.

Alternate opponents:
Change the date to May 16 of any year before starting the game. Laser shooting cows and barrels will appear during game play.

Items available:
Change the date to May 16 of any year before starting the game. Click once on the plus/minus sign on the game menu (Bravo, Tango, etc).

Unlimited money:
Select a mission that has a weapon other than the standard lasers as equipment. Abort the mission and sell the weapon. Repeat this process to earn an unlimited amount of money.

Cheat mode:
Before loading the game, enter the game's directory and type SET S_HOST=CASTLE (case-sensitive) at the command line. Then, type rap to load the game. All weapons, $900,000, unlimited health, and five bombs will be available when game play begins.

Mission skip:
Enable the "Cheat mode" code and start a mission. Press [Esc] and select "Yes" to abort the mission. Enter the mission again and abort, but select "No" this time. The game will end the mission and return to the hangar screen. Play the mission to jump to the next mission.

Level select:
Press a key that corresponds to a specific sector, followed by the key that corresponds to a specific level at the sector screen.